Endocrine diabetic foot biopsy device

Abstract

The application belongs to the technical field of medical devices, and specifically provides an endocrine diabetic foot taking device, which comprises a sample box, a sealing cover, a suction pump, a float plug, a sealed tube, a piston, a spring, a switch, a docking nozzle and a liquid discharge pipe. The sealing cover and the sample box are in interference static sealing through a sealing ring. The suction pump provides negative pressure power for sampling. The float plug can automatically block the air inlet of the suction pump when the sample is full. The spring, the piston and the switch can automatically cut off the power supply of the pump body when the negative pressure exceeds the safety threshold. The liquid discharge pipe directs the sample to the bottom of the sample box. The endocrine diabetic foot taking device is reliable in sealing, convenient to operate, can effectively improve the safety of taking, and reduce the risk of cross infection and the cost of clinical use.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a device for detecting diabetic foot ulcers caused by endocrine disorders. Background Technology

[0002] The negative pressure suction sampler relies on a negative pressure vacuum pump to generate negative pressure suction. Through a special sampling probe, it is inserted into the deep part of diabetic foot ulcers, sinus tracts, or liquefied necrotic wounds. Using the negative pressure difference, it automatically sucks the pus, exudate, deep secretions, and necrotic tissue debris from the wound into a sealed sampling container. The entire process isolates the surface bacteria of the body and avoids external contamination, achieving sterile and accurate sampling of deep lesions for pathogen culture and laboratory testing.

[0003] When a negative pressure suction sampler encounters normal human tissue during sampling, the suction tube becomes obstructed, and the negative pressure increases accordingly, resulting in the forced suction of healthy human tissue. This leads to a relatively low safety factor for the negative pressure suction sampler's forced sampling. Summary of the Invention

[0004] The purpose of this invention is to provide a device for detecting endocrine diabetic foot ulcers, so as to at least solve the technical problem that the safety factor of traditional negative pressure suction samplers for hard aspiration is relatively low.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Endocrine diabetic foot retrieval device, including: The sample box is a container with an opening at the top. A sealing cap is provided at the opening of the sample box, and a sealing ring is provided between the sealing cap and the sample box. A vacuum pump, installed on the sealing cover, is used to draw gas from the sample box to create a negative pressure; a float plug is movably arranged along the suction port of the vacuum pump. The float plug is made of a material with a density less than that of the sample being collected, so that it floats up due to buoyancy and blocks the suction port when the sample liquid level rises in the sample box. A sealing tube is fixedly connected to one side of the sealing cap, and its inner cavity is connected to the inner cavity of the sample box; a piston is movably and sealed inside the sealing tube; a spring is sleeved on the outside of the sealing tube, the upper end of the spring supports the upper part of the piston, and the lower end of the spring is fixed to the sealing cap, providing an upward preload force for the piston; The connector is sealed and inserted into the sealing cap. The lower end of the connector extends into the sample box. The lower end of the connector is connected to a drain pipe, which is used to guide the collected sample into the sample box. A switch is used to control the start and stop of the vacuum pump. The switch is a push-button switch with its trigger end facing upward and located directly below the piston. The switch is connected in series in the power supply circuit of the vacuum pump, and disconnects the working power of the vacuum pump when pressed. The preload of the spring is configured such that: when the negative pressure in the sample box is within the normal working range, the piston does not contact the switch; when sampling is obstructed and the negative pressure in the sample box exceeds the safety threshold, the negative pressure overcomes the preload of the spring, drives the piston downward and presses the switch, disconnecting the power to the vacuum pump.

[0006] Furthermore, the sealing ring includes a ring body and a plurality of inserts integrally formed on the upper end face of the ring body. The lower outer periphery of the sealing cover has an insertion port that corresponds one-to-one with the position of the inserts, and the inserts are interference-fitted into the insertion port.

[0007] Furthermore, the air pump is installed in the middle of the sealing cover via a threaded seal; The sealing cap has a threaded hole in the middle, and the lower part of the air pump has a first threaded tube that mates with the threaded hole. A first sealing ring is fitted on the first threaded tube, and the first sealing ring is pressed between the air pump and the sealing cap. The lower end of the first threaded tube is provided with an integrally formed retaining ring on its inner wall.

[0008] Furthermore, the float plug includes a float block, a guide slide rod, a second sealing ring, and a limiting block. The lower end of the guide slide rod is fixed to the float block, and the upper end is fixed to the limiting block. The guide slide rod is movably inserted into the first threaded tube. The limiting block cooperates with the retaining ring to limit the downward limit position of the float plug. The second sealing ring is fixedly sleeved on the guide slide rod and located between the float and the limiting block. When the float rises to the sealing position, the second sealing ring is sealed and fitted to the lower end face of the first threaded tube.

[0009] Furthermore, the sealing tube includes a first tube body and a guide post. The lower end of the first tube body is fixedly and sealed to the sealing cap, and its inner cavity communicates with the inner cavity of the sample box through a vent on the sealing cap. The guide post consists of two symmetrically arranged guide rods, which are fixed to the upper end of the first tube and extend upward. The spring is sleeved on the outside of the first tube and the guide post.

[0010] Furthermore, the piston includes a movable disc, a movable rod, and a plug body. The movable disc has a through hole that slides with the guide post. The upper end of the movable rod is fixed to the movable disc, and the lower end is fixed to the plug body. The plug body is movably and sealingly fitted into the inner cavity of the first tube. The upper end of the spring is fixed to the lower end face of the movable disc.

[0011] Furthermore, the connector includes an insertion tube, a first knob, a third sealing ring, and a second threaded tube. The sealing cap has an insertion hole, the second threaded tube passes through the insertion hole and extends downward, the upper end of the drain tube is threadedly connected to the second threaded tube, and the third sealing ring is pressed between the first knob and the sealing cap.

[0012] Furthermore, the lower end of the drain tube extends to the lower part of the inner cavity of the sample box to guide the collected sample to the bottom of the sample box.

[0013] Furthermore, the surface of the float has a hydrophobic and antibacterial coating.

[0014] Furthermore, the sealing cap includes a cap body and a positioning plate integrally formed on the lower end of the cap body, the positioning plate engaging and matching the opening of the sample box; The sealing ring is held between the lower end face of the cover and the open end face of the sample box.

[0015] In summary, the technical effects and advantages of the endocrine diabetic foot sampling device of the present invention are as follows: Place the sampling tube over the sealing tube, and then place the sealing cap over the sample box. Turn on the power to the vacuum pump, which will extract the gas from the sample box, creating a negative pressure. This negative pressure will then act downwards on the sealing cap, stabilizing it in place. The sample is then drawn into the sample box through the drain tube. When the liquid in the sample box comes into contact with the float, buoyancy will push it upwards, causing it to slide until it blocks the vacuum pump's suction port, preventing sample overflow. When sampling is obstructed, the negative pressure inside the sample box increases, causing the spring to act downwards on the piston, which in turn pushes the switch down, disconnecting the vacuum pump's power. This system prevents overflow through the float and automatically shuts off when blocked, preventing aspiration injury to the patient and improving safety. When the liquid in the sample box submerges the float, the buoyancy acts upward on the float, causing it to move the second sealing ring upward until it contacts the first threaded tube. The second sealing ring and the float shield the entrance of the first threaded tube, facilitating automatic air intake prevention when the sample box is full. When the stopper slides downward under strong negative pressure, the movable rod acts downward on the movable plate, causing the movable plate to compress the spring and press the switch to close one end, facilitating automatic switch closure. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the endocrine diabetic foot retrieval device provided by the present invention. Figure 2 This is a schematic diagram of the sealing cap structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the sealing ring structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the air pump structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the float structure provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the sealing tube structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the piston structure provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the docking nozzle structure provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the drain pipe structure provided in an embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1. Sample box; 2. Sealing cap; 21. Cap body; 22. Positioning plate; 23. Threaded hole; 24. Insertion hole; 25. Vent; 26. Insertion port; 3. Sealing ring; 31. Ring body; 32. Insert block; 4. Air pump; 41. Pump body; 42. First threaded pipe; 43. First sealing ring; 44. Retaining ring; 5. Float plug; 51. Float block; 52. Second sealing ring; 53. Guide slide rod; 54. Limiting block; 6. Sealing tube; 61. First tube body; 62. Guide column; 7. Piston; 71. Moving plate; 72. Moving rod; 73. Plug body; 74. Through hole; 8. Connecting nozzle; 81. Insert tube; 82. First knob; 83. Third sealing ring; 84. Second threaded tube; 9. Drain pipe; 91. Second tube body; 92. Second knob; 10. Switch; 11. Spring. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some preferred embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the endocrine diabetic foot sampling device provided by the present invention includes a sample box 1, which is a transparent sterile sealed container with an open top for holding the required samples such as secretions and necrotic tissue from the diabetic foot wound. A sealing cap 2 is fitted to the upper opening of the sample box 1, and a sealing ring 3 is fixedly installed on the lower part of the sealing cap 2. The sealing ring 3 and the opening end face of the sample box 1 are matched with an interference fit to achieve a static seal between the sample box 1 and the sealing cap 2, thereby isolating the sample from external environmental contamination.

[0021] Furthermore, the present invention uses the interference fit of the sealing ring 3 to perform static sealing before the sampling device is put into operation. At the same time, during the subsequent negative pressure establishment process, the negative pressure in the sample box 1 will further attract the sealing cover 2 towards the sample box 1, forming a negative pressure self-tightening sealing effect, improving the sealing performance during the operation of the device, and avoiding problems such as insufficient sampling suction and sample contamination caused by negative pressure leakage.

[0022] Please continue to refer to Figure 1 In one specific implementation of the present invention, a vacuum pump 4 is installed in the middle of the sealing cover 2 by means of a threaded seal; the vacuum pump 4 is a miniature DC electric vacuum pump, which is used to provide negative pressure sampling power for the sample box 1; a float 5 is movably installed at the lower part of the vacuum pump 4, the float 5 is made of low-density medical polymer material, and can slide along the suction port of the vacuum pump 4 under the action of sample liquid buoyancy, so as to achieve the sealing of the suction port in the full liquid state; Specifically, the float plug 5 in this embodiment is made of medical-grade low-density polypropylene, which has a density less than that of the sample (pus, exudate, etc.) to ensure that the sample liquid surface can stably provide upward buoyancy after contacting the float plug 5, avoiding the problem of insufficient buoyancy and sealing failure due to excessive material density; at the same time, the surface of the float plug 5 in this embodiment is treated with hydrophobic and antibacterial treatment to avoid sliding and jamming caused by sample adhesion.

[0023] Furthermore, a sealing tube 6 is fixedly and sealed to one side of the sealing cap 2. The inner cavity of the sealing tube 6 is connected to the inner cavity of the sample box 1. A piston 7 is movably and sealed inside the sealing tube 6. A spring 11 is movably sleeved on the outside of the sealing tube 6. The upper end of the spring 11 supports the upper part of the piston 7. The lower end of the spring 11 is fixedly connected to the upper surface of the sealing cap 2. The spring 11 provides an upward pre-tightening and reset elastic force for the piston 7. The pre-tightening force of the spring 11 can be matched according to the clinical safety negative pressure threshold: under normal sampling conditions, the working negative pressure in the sample box 1 cannot overcome the pre-tightening force of the spring 11, and the piston 7 remains in the initial high position; when sampling is obstructed and the negative pressure exceeds the safety threshold (corresponding to the condition of aspirating healthy tissue or tube blockage), the negative pressure force can overcome the pre-tightening force of the spring 11, driving the piston 7 to move downward, thereby triggering the overload protection.

[0024] In addition, the sealing cap 2 of this embodiment of the invention is fitted with a connecting nozzle 8 on its side. The lower end of the connecting nozzle 8 extends through the sealing cap 2 into the sample box 1. The lower end of the connecting nozzle 8 is threaded with a drain pipe 9. The lower end of the drain pipe 9 extends into the lower part of the inner cavity of the sample box 1 to realize the directional flow of the sample. A push-button switch 10 is also fixedly connected to the sealing cover 2. The trigger end of the switch 10 faces upward and is located directly below the piston 7. The power supply circuit of the air pump 4 is connected in series with the switch 10. When the switch 10 is pressed, the working power supply of the air pump 4 is disconnected. The upper end face of the float 5 is sealed and matched with the lower end air intake of the air pump 4. The upper end of the sealing tube 6 extends through the upper part of the piston 7, providing axial guidance for the piston 7 to slide up and down. The drain pipe 9 extends to the bottom of the sample box 1, which can directly guide the collected sample to the bottom of the sample box 1, avoiding sample splashing and contaminating the suction port of the air pump 4, while ensuring that the sample liquid level rises steadily and ensuring the stability of the triggering of the float plug 5.

[0025] In use, the sampling tube is fitted onto the sealing tube 6, and the sealing cap 2 is placed on the sample box 1. The switch 10 is turned on to connect the working power of the vacuum pump 4. The vacuum pump 4 extracts the gas from the sample box 1, creating a negative pressure inside the sample box 1. At the same time, the negative pressure acts downward on the sealing cap 2, stabilizing the sealing cap 2 on the sample box 1. The sample is drawn into the sample box 1 through the drain tube 9 using the negative pressure. When the liquid in the sample box 1 comes into contact with the float 5, the buoyancy acts upward on the float 5, causing the float 5 to slide upward until the float 5 blocks the suction port of the vacuum pump 4, preventing the sample from overflowing from the sample box 1. When the sampling is obstructed, the negative pressure inside the sample box 1 increases, causing the negative pressure to overcome the spring 11 and act downward on the piston 7, causing the piston 7 to press down on the switch 10, disconnecting the working power of the vacuum pump 4.

[0026] like Figure 1 and 2 As shown, in one implementation of the present invention, the sealing cover 2 includes a cover body 21 and a positioning plate 22. The outer periphery of the cover body 21 is provided with an insertion port 26. The cover body 21 and the positioning plate 22 are provided with threaded holes 23, insertion holes 24 and vents 25. The positioning plate 22 is fixedly connected to the lower end of the cover body 21 and is engaged with the opening of the sample box 1. Furthermore, in this embodiment of the invention, the switch 10 is fixedly connected to the cover 21, and the lower end of the spring 11 is fixedly connected to the cover 21; the threaded hole 23 is used for threaded installation of the air pump 4, the insertion hole 24 is used for installation of the sealing tube 6, and the insertion port 26 is used for snapping the sealing ring 3.

[0027] In one specific implementation, the cover 21 and the positioning plate 22 are integrally injection molded medical-grade polycarbonate structures, and the two are coaxially arranged; the threaded hole 23 is an internal threaded through hole, which is opened at the center of the cover 21 and the positioning plate 22. Its thread profile adopts a sealing pipe thread, which is used to achieve threaded sealing installation with the air pump 4 to ensure airtightness under negative pressure. The insertion hole 24 is a smooth through hole that extends along the axial direction of the cover 21 and the positioning plate 22. It is used to seal the through-hole 8. The inner wall of the insertion hole 24 is polished to reduce the wear of the seal during assembly. The vent 25 is an axially penetrating through hole, which is opened on the cover 21 and the positioning plate 22 to connect the inner cavity of the sealing tube 6 with the inner cavity of the sample box 1, ensuring that the negative pressure signal can be transmitted to the piston 7 without delay. The insertion port 26 is an axial blind groove evenly distributed around the circumference of the cover 21. It is opened at the outer periphery of the lower end of the cover 21 and is used to snap and position with the sealing ring 3 to prevent the sealing ring 3 from shifting or falling off during assembly and use.

[0028] like Figures 1-3 As shown, the sealing ring 3 is a medical-grade silicone rubber integral molded structure, including the ring body 31 and the insert block 32; in: The ring body 31 has an annular flat structure. Its inner diameter matches the inner diameter of the opening of the sample box 1, and its outer diameter matches the outer diameter of the opening of the sample box 1. Preferably, an annular sealing lip can be opened on the lower end face of the ring body 31. After assembly, it can form a multi-line seal with the opening end face of the sample box 1 through interference compression, which greatly improves the sealing reliability under negative pressure. The insert 32 is a block-shaped protrusion that corresponds one-to-one with the number and position of the sockets 26. It is evenly and fixedly connected to the outer periphery of the upper end face of the ring body 31. The insert 32 and the socket 26 are interference fit. The end of the insert 32 is rounded to facilitate insertion into the socket 26 during assembly. Through the snap-fit ​​positioning of the insert 32 and the socket 26, the ring body 31 can be stably held at the lower end of the cover 21, preventing the sealing ring 3 from shifting or falling off during the disassembly and assembly of the sealing cover 2. At the same time, no additional adhesive fixing is required, which facilitates the individual replacement and sterilization of the sealing ring 3 and reduces the cost of use.

[0029] like Figure 1 , Figure 2 and Figure 4 As shown, the vacuum pump 4 is a miniature DC brushless electric vacuum pump, including a pump body 41, a first threaded pipe 42, a first sealing ring 43 and a retaining ring 44; The first threaded tube 42 is a hollow external threaded tube body. Its upper end is integrally sealed and fixedly connected to the air intake end of the pump body 41. The external thread of the first threaded tube 42 matches the internal thread of the threaded hole 23. After the two are threadedly connected, the pump body 41 and the sealing cover 2 can be detachably fixed. The first sealing ring 43 is a medical fluororubber flat washer, which is movably sleeved on the outside of the first threaded tube 42. After assembly, it is pressed between the lower end face of the pump body 41 and the upper end face of the cover 21. Through axial compression, a static seal is formed on the end face, which isolates the leakage channel of the threaded fit gap and ensures negative pressure in the sample box 1. The retaining ring 44 is an annular protrusion, integrally fixed to the inner wall of the lower end of the first threaded tube 42. The inner diameter of the retaining ring 44 is smaller than the inner diameter of the first threaded tube 42. It is used to limit the upward movement of the float 5, preventing the float 5 from completely entering the first threaded tube 42 under the action of buoyancy and causing jamming. At the same time, it ensures that the float 5 can be aligned with the lower port of the first threaded tube 42 to achieve sealing.

[0030] The present invention enables quick assembly and disassembly of the air pump 4 and the sealing cover 2 through the threaded connection structure of the first threaded tube 42 and the threaded hole 23. This facilitates the individual inspection and replacement of the air pump 4, as well as the high-temperature sterilization of each component of the sealing cover 2. The detachable structure also allows for the replacement of pump bodies with different negative pressure parameters according to sampling requirements, improving the clinical adaptability of the device and making it easy to disassemble for disinfection and sterilization.

[0031] like Figure 1 , Figure 4 and Figure 5As shown, the float plug 5 is a one-piece molded structure made of medical-grade low-density polymer material. Its overall density is less than that of clinical samples such as pus and exudate, ensuring stable floating in the sample liquid. The float plug 5 specifically includes a float block 51, a guide slide rod 53, a second sealing ring 52, and a limiting block 54. The float block 51 is a cylindrical solid float with a hydrophobic and antibacterial nano-coating on its surface, which can prevent floating and jamming caused by the adhesion of sample proteins and tissue debris, ensuring the buoyancy trigger response sensitivity. The limiting block 54 is a wedge-shaped protrusion, one-piece... The upper end of the limiting block 54 is fixedly connected to the upper end of the corresponding guide slide 53. The upper end surface of the limiting block 54 is a horizontal limiting surface. After assembly, it is movably fastened to the lower end surface of the retaining ring 44 to realize the downward limiting of the float 5, prevent the float 5 from falling out of the first threaded tube 42, and provide radial guidance for the up and down sliding of the float 5. The second sealing ring 52 is a medical silicone rubber O-ring, which is fixedly sleeved on the outside of the guide slide 53 and located between the upper end surface of the float 51 and the limiting block 54. The outer diameter of the second sealing ring 52 is larger than the lower end inner diameter of the first threaded tube 42.

[0032] Preferably, the guide slide rod 53 and the float 51 are integrally injection molded, both of which are made of medical-grade low-density polypropylene, and a radial gap of 0.2-0.5mm is reserved between the guide slide rod 53 and the inner wall of the first threaded tube 42. When the liquid level of the sample in the sample box 1 rises and submerges the float 51, the buoyancy of the liquid continues to act upward on the float 51, overcoming the weight of the float 5 itself and rising until the upper end face of the second sealing ring 52 is tightly fitted with the lower end face of the first threaded tube 42. The compression deformation of the second sealing ring 52 forms an end face seal, which, together with the float 51, completely shields the air intake of the first threaded tube 42, realizing automatic sealing of the sample box 1 when it is full of liquid, and preventing the sample from being sucked into the air pump 4, causing equipment damage and sample overflow contamination.

[0033] like Figure 1 , Figure 2 and Figure 6 As shown, the sealing tube 6 is a medical-grade polysulfone material integrally molded structure, including a first tube body 61 and a guide post 62. The first tube body 61 is a hollow round tube with an open upper end and a closed lower end. Its lower end is integrally sealed and fixedly connected to the upper surface of the cover body 21 by ultrasonic welding. The inner cavity of the first tube body 61 is completely connected to the inner cavity of the sample box 1 through the vent 25, ensuring that the negative pressure change in the sample box 1 can be transmitted to the inner cavity of the first tube body 61 in real time and synchronously. The guide post 62 consists of two symmetrically arranged guide rods, the lower ends of which are integrally fixedly connected to the upper end face of the first tube body 61. The central axis of the guide post 62 is parallel to the central axis of the first tube body 61. Preferably, a limiting end can be provided at the upper end of the guide post 62 to limit the upward stroke of the piston 7 and prevent the piston 7 from disengaging from the guide post 62. The spring 11 is movably sleeved on the outside of the first tube 61 and the guide post 62. Through the double radial limiting of the first tube 61 and the guide post 62, radial bending and swaying of the spring 11 during compression can be prevented, ensuring the linear output of the spring force.

[0034] The inner wall of the first tube 61 is mirror polished to form a movable seal with the lower end of the piston 7, ensuring the sensitivity of the negative pressure driven piston 7. The guide post 62 is used to provide axial guidance for the up and down sliding of the piston 7, to avoid deflection of the piston 7 during sliding, to ensure that the piston 7 can accurately trigger the switch 10, and to prevent the protection mechanism from being falsely triggered or failing.

[0035] like Figure 1 , Figure 6 and Figure 7 As shown, the piston 7 includes a movable disc 71, a movable rod 72, and a plug body 73. The movable disc 71 has a through hole 74, and the guide post 62 is movably inserted into the through hole 74. The upper end of the movable rod 72 is fixedly connected to the lower end of the movable disc 71, and the plug body 73 is fixedly connected to the lower end of the movable rod 72. The plug body 73 is movably sealed in the first tube 61, and the upper end of the spring 11 is fixedly connected to the lower end of the movable disc 71. When the plug 73 slides downward under strong negative pressure, it acts downward on the movable disc 71 through the movable rod 72, causing the movable disc 71 to compress the spring 11 downward, and causing the movable disc 71 to press the switch 10 to close one end.

[0036] like Figure 1 , Figure 6 and Figure 7 As shown, the piston 7 is a one-piece molded structure made of medical-grade polyoxymethylene material, which has a low coefficient of friction and high wear resistance, and includes a movable disc 71, a movable rod 72 and a plug body 73; The movable disk 71 is a circular disk structure with two through holes 74 symmetrically cut out. The inner diameter of the through hole 74 is clearance-fitted with the guide post 62. The guide post 62 is movably inserted into the corresponding through hole 74, so that the movable disk 71 can slide along the guide post 62 with low resistance. The upper end of the movable rod 72 is integrally fixedly connected to the lower end face of the movable disk 71, and the lower end of the movable rod 72 extends downward into the inner cavity of the first tube 61 to transmit negative pressure driving force; the plug 73 is a circular piston head, the upper end face of which is integrally fixedly connected to the lower end of the movable rod 72, and the plug 73 is movably sealed in the inner cavity of the first tube 61, dividing the inner cavity of the first tube 61 into two independent chambers, the lower chamber is connected to the sample box 1 through the vent 25, and the upper chamber is connected to the outside atmosphere; The upper end of the spring 11 is fixedly connected to the lower end face of the movable disk 71; Under normal sampling conditions, the working negative pressure inside sample box 1 cannot overcome the pre-tightening force of spring 11, piston 7 remains in its initial high position, switch 10 is in the conducting state, and vacuum pump 4 works normally. When the sampling pipeline is blocked or healthy tissue is sucked in, causing the negative pressure inside sample box 1 to increase sharply and exceed the safety threshold, the negative pressure force acts on the plug body 73 through the lower chamber of the first tube 61, overcoming the pre-tightening force of spring 11 and driving the plug body 73, movable rod 72, and movable disc 71 to slide downwards synchronously. While the movable disc 71 compresses spring 11 downwards, its lower end face presses the trigger end of switch 10, causing switch 10 to open and cutting off the working power of vacuum pump 4, realizing automatic shutdown under sampling overload conditions and protecting against the problem of negative pressure hard suction damaging the patient's healthy tissue. After sampling, the negative pressure inside sample box 1 disappears, and the rebound force of spring 11 drives piston 7 to automatically move upward and reset, and switch 10 returns to the conducting state, making it convenient for the device to be used next time.

[0037] like Figure 1 , Figure 2 and Figure 8 As shown, the connector 8 includes a tube 81, a first knob 82, a third sealing ring 83, and a second threaded tube 84. The lower end of the tube 81 is fixedly connected to the upper end of the second threaded tube 84, the first knob 82 is fixedly connected to the lower part of the tube 81, and the third sealing ring 83 is fitted onto the second threaded tube 84. The second threaded tube 84 is passed through the insertion hole 24, and then the drain tube 9 is tightened onto the second threaded tube 84, so that the third sealing ring 83 seals between the cover 21 and the first knob 82.

[0038] like Figure 1 , Figure 2 and Figure 8 As shown, the docking nozzle 8 is a medical-grade polypropylene one-piece molded structure, a disposable sterile component, including a cannula 81, a first knob 82, a third sealing ring 83, and a second threaded tube 84. The cannula 81 is a hollow tube body, which can achieve standardized sealing docking with clinically common sampling tubes and puncture needles to prevent tube detachment and air leakage. The first knob 82 is a hexagonal anti-slip knob, which is integrally fixed to the lower outer wall of the cannula 81. The outer circumference of the knob is provided with anti-slip knurling, which makes it easy for medical staff to screw and assemble by hand without additional tools. The second threaded tube 84 is a hollow external threaded tube body. Its upper end is integrally and coaxially fixedly connected to the lower end of the insertion tube 81. The outer diameter of the second threaded tube 84 matches the inner diameter of the insertion hole 24. During assembly, the second threaded tube 84 passes through the insertion hole 24 from top to bottom and extends to the bottom of the cover 21. The third sealing ring 83 is a medical silicone rubber flat washer, which is movably sleeved on the outside of the second threaded tube 84. After assembly, it is pressed between the lower end face of the first knob 82 and the upper end face of the cover 21 to form a static seal on the end face, thus isolating the gap leakage channel of the insertion hole 24.

[0039] The present invention enables quick and detachable fixing of the nozzle 8 and the sealing cap 2 through the threaded engagement of the second threaded tube 84 and the drain tube 9, facilitating the one-time replacement of the nozzle 8 after sampling and avoiding cross-infection; at the same time, the nozzle 8 with different specifications of insertion tube 81 can be replaced according to clinical sampling needs, thereby expanding the scope of clinical applicability.

[0040] like Figure 1 , Figure 8 and Figure 9 As shown, the drain tube 9 is a one-piece molded structure made of medical-grade polycarbonate material, with mirror polishing treatment on the inner wall to reduce sample flow resistance and avoid tissue debris and pus residue. It includes the second tube body 91 and the second knob 92. The second tube 91 is a hollow internally threaded tube with an open top. Its internal thread matches the external thread of the second threaded tube 84. After the two are threaded together, the upper end of the second tube 91 can clamp the cover 21 between it and the first knob 82. The lower end of the second tube 91 extends to the lower part of the inner cavity of the sample box 1, which can directly guide the collected sample to the bottom of the sample box 1, avoid liquid level detection errors caused by sample splashing, and prevent sample aerosol from contaminating the various parts of the sealing cover 2. The second knob 92 is a hexagonal anti-slip knob, which is integrally fixed to the upper outer wall of the second tube body 91. Its outer circumference is provided with anti-slip knurling. It works in conjunction with the first knob 82 to facilitate medical staff to quickly assemble and disassemble the docking nozzle 8 and the drainage tube 9 by turning the two knobs in opposite directions. At the same time, it can control the thread tightening torque to ensure sealing performance while avoiding thread stripping.

[0041] Before clinical use, modular assembly must be completed in a sterile environment. The specific steps are as follows: Insert the insert block 32 of the sealing ring 3 into the socket 26 of the sealing cover 2 to pre-fix the sealing ring 3 and the sealing cover 2, so as to avoid the sealing ring 3 from shifting during the assembly process and causing sealing failure. The first threaded pipe 42 of the air pump 4 is screwed into the threaded hole 23 of the sealing cover 2. After tightening, the end face seal between the pump body 41 and the cover 21 is achieved through the first sealing ring 43. At the same time, the limiting block 54 of the float 5 is inserted into the retaining ring 44 through the elastic deformation of the guide slide rod 53, thus completing the axial limiting of the float 5 and preventing the float 5 from falling off. After passing the second threaded tube 84 of the docking nozzle 8 through the insertion hole 24 of the sealing cap 2 and fitting the third sealing ring 83, tighten the second tube body 91 of the drain tube 9 at the lower end of the second threaded tube 84 to complete the assembly and sealing of the sampling channel. The piston 7's plug 73 is inserted into the first tube 61 of the sealing tube 6, the guide post 62 passes through the through hole 74 of the movable plate 71, and the spring 11 is sleeved on the outside of the sealing tube 6 and its two ends are fixed to the movable plate 71 and the cover 21 respectively, thus completing the assembly of the overload protection mechanism. The assembled sealing cap 2 is placed over the opening of the sterile sample box 1. The positioning plate 22 is inserted into the inner wall of the opening of the sample box 1 to achieve radial positioning. The sealing ring 3 is tightly fitted to the end face of the opening of the sample box 1, thus completing the overall assembly of the device.

[0042] This invention, through its modular assembly structure, allows all components that come into contact with the sample to be individually sterilized or replaced once, thus meeting the requirements of clinical aseptic operation and enabling the reuse of components, thereby reducing clinical usage costs.

[0043] After assembly, one end of the clinical sampling tubing is attached to the insertion tube 81 of the docking nozzle 8, and the other end of the sampling tubing is inserted into the target sampling location deep in the diabetic foot ulcer, sinus tract, or necrotic wound. Press the switch 10, the switch 10 is in the conducting state, the power supply circuit of the air pump 4 is connected, and the air pump 4 starts working.

[0044] The vacuum pump 4 continuously draws air from the sample box 1 through the first threaded pipe 42 at its lower end, creating a stable negative pressure environment inside the sample box 1. At this time, a pressure difference is formed between the negative pressure inside the sample box 1 and the external atmospheric pressure, which has two effects: First, an adsorption force is applied downward to the entire sealing cover 2, so that the sealing cover 2 is firmly pressed against the opening of the sample box 1, and the compression of the sealing ring 3 is further increased, forming a negative pressure self-tightening sealing effect. Moreover, no additional locking structure is required, which simplifies the operation steps of the device and improves the sealing reliability. Secondly, a continuous negative pressure flow channel is formed by connecting nozzle 8, drain tube 9, and sampling hose. The test samples such as pus, exudate, and necrotic tissue debris from the wound are continuously sucked into the sample box 1 by negative pressure suction to complete the aseptic sampling operation. The sample is directly guided to the bottom of the sample box 1 through drain tube 9 to avoid sample splashing and ensure the stability of the sampling process.

[0045] As the sample liquid level in sample box 1 continues to rise until it contacts the bottom of the float 51 of float plug 5, the sample liquid generates an upward buoyancy force on float 51. As the liquid level continues to rise, the buoyancy force continues to increase. When the buoyancy force is greater than the weight of float plug 5 itself, float 51 drives guide slide rod 53 and limit stop 54 to slide upward along the inner wall of first threaded tube 42 until the second sealing ring 52 at the upper end of float 51 is tightly attached to the lower end face of first threaded tube 42. At this time, float plug 5 completely blocks the air intake of air pump 4, air pump 4 can no longer extract air from sample box 1, the negative pressure in sample box 1 no longer increases, and the sampling suction force automatically disappears. Meanwhile, during the upward sliding process, the limit block 54 is always restricted by the retaining ring 44 to limit the maximum axial stroke, so as to prevent the float 5 from being sucked into the vacuum pump 4 and causing damage to the pump body; the second sealing ring 52 is made of medical silicone material and forms a surface seal with the lower end face of the first threaded tube 42. After sealing, it can completely isolate the suction port from the cavity of the sample box 1. Even if the vacuum pump 4 continues to work, the sample will not be sucked into the pump body.

[0046] This invention achieves automatic sealing protection when the sample box is full of liquid, solving the problem that traditional sampling devices cause samples to be sucked into the vacuum pump after overflowing, resulting in pump damage and sample loss. In addition, the negative pressure inside the sample box remains stable after sealing, preventing sample backflow and wound contamination caused by negative pressure leakage, thus further improving the safety of clinical use.

[0047] During the sampling process, if the sampling tube is blocked by necrotic tissue or the end of the tube is adsorbed onto the patient's healthy tissue, the sampling flow channel will be blocked, and outside air cannot enter the sample box 1 through the flow channel. The continuous pumping of air by the vacuum pump 4 will cause the negative pressure intensity inside the sample box 1 to rise sharply, forming an overload negative pressure condition. At this time, the overload negative pressure in the sample box 1 generates a downward suction force on the piston 7's plug 73 through the inner cavity of the sealing tube 6; when the suction force is greater than the upward preload of the spring 11, the plug 73 drives the movable rod 72 and the movable disk 71 to slide downward along the guide post 62, and the movable disk 71 compresses the spring 11 downward until the lower surface of the movable disk 71 presses against the trigger end of the switch 10; after the switch 10 is pressed, the power supply circuit of the vacuum pump 4 is immediately disconnected, the vacuum pump 4 stops working, the negative pressure in the sample box 1 no longer continues to rise, and the sampling suction disappears.

[0048] Once the fault is cleared, the negative pressure inside sample box 1 returns to the normal range. The elastic force of spring 11 drives piston 7 to reset upward, switch 10 returns to the conducting state, and vacuum pump 4 can restart, thus enabling the protection mechanism to be repeatedly triggered.

[0049] After sampling is completed, first disconnect the power supply to the vacuum pump 4. After the negative pressure in the sample box 1 returns to normal pressure, the sealing cover 2 can be opened and the sample in the sample box 1 can be sent for testing. After use, disposable parts that come into contact with the sample, such as the drain tube 9, the connecting nozzle 8, the sealing ring 3, and the sample box 1, can be disassembled and discarded. Parts such as the vacuum pump 4 and the sealing cover 2 can be reused after disinfection, which reduces the cost of clinical use and avoids cross-infection.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0051] The specification briefly mentions the application directions of existing technologies known to those skilled in the art without modification, which are combined with the invention to form a complete technology; it avoids excessive popularization of technologies familiar to those skilled in the art, in order to help those skilled in the art quickly understand the main content of the invention.

Claims

1. An endocrine-related diabetic foot retrieval device, characterized in that, include: The sample box (1) is a container with an opening at the top. A sealing cap (2) is provided at the opening of the sample box (1), and a sealing ring (3) is provided between the sealing cap (2) and the sample box (1). A vacuum pump (4) is installed on the sealing cover (2) to draw gas from the sample box (1) to form a negative pressure; a float (5) is movably arranged along the suction port of the vacuum pump (4). The float (5) is made of a material with a density less than that of the sample collected, so that it floats up under buoyancy and blocks the suction port when the sample liquid level rises in the sample box (1). A sealing tube (6) is fixedly connected to one side of the sealing cover (2), and its inner cavity is connected to the inner cavity of the sample box (1); a piston (7) is movably sealed inside the sealing tube (6); a spring (11) is sleeved on the outside of the sealing tube (6), the upper end of the spring (11) supports the upper part of the piston (7), and the lower end of the spring (11) is fixed to the sealing cover (2) to provide an upward preload force for the piston (7); The nozzle (8) is sealed and inserted into the sealing cover (2). The lower end of the nozzle (8) extends into the sample box (1). The lower end of the nozzle (8) is connected to a drain pipe (9). The drain pipe (9) is used to introduce the collected sample into the sample box (1). A switch (10) is used to control the start and stop of the vacuum pump (4). The switch (10) is a push-button switch with its trigger end facing upward and located directly below the piston (7). The switch (10) is connected in series in the power supply circuit of the vacuum pump (4) and disconnects the working power of the vacuum pump (4) when it is pressed. The preload of the spring (11) is configured such that when the negative pressure in the sample box (1) is within the normal working range, the piston (7) does not contact the switch (10). When sampling is obstructed and the negative pressure in the sample box (1) exceeds the safety threshold, the negative pressure overcomes the preload of the spring (11) and drives the piston (7) to move downward and press the switch (10), disconnecting the power of the vacuum pump (4).

2. The endocrine diabetic foot sampling device according to claim 1, characterized in that, The sealing ring (3) includes a ring body (31) and a plurality of inserts (32) integrally formed on the upper surface of the ring body (31). The lower outer periphery of the cover body (21) of the sealing cover (2) is provided with an insertion port (26) corresponding to the position of the inserts (32). The inserts (32) are press-fitted into the insertion port (26).

3. The endocrine diabetic foot retrieval device according to claim 2, characterized in that, The air pump (4) is installed in the middle of the sealing cover (2) by a threaded seal; A threaded hole (23) is provided in the middle of the sealing cover (2), and a first threaded tube (42) that mates with the threaded hole (23) is provided at the lower part of the air pump (4). A first sealing ring (43) is fitted on the first threaded tube (42), and the first sealing ring (43) is pressed between the air pump (4) and the sealing cover (2). The lower end of the first threaded tube (42) is provided with an integrally formed retaining ring (44).

4. The endocrine diabetic foot sampling device according to claim 3, characterized in that, The float plug (5) includes a float (51), a guide slide rod (53), a second sealing ring (52), and a limiting block (54). The lower end of the guide slide rod (53) is fixed to the float (51), and the upper end is fixed to the limiting block (54). The guide slide rod (53) is movably inserted into the first threaded tube (42). The limiting block (54) cooperates with the retaining ring (44) to limit the downward limit position of the float plug (5). The second sealing ring (52) is fixedly sleeved on the guide slide rod (53) and located between the float (51) and the limiting block (54). When the float plug (5) floats up to the sealing position, the second sealing ring (52) seals against the lower end face of the first threaded tube (42).

5. The endocrine diabetic foot retrieval device according to claim 4, characterized in that, The sealing tube (6) includes a first tube body (61) and a guide post (62). The lower end of the first tube body (61) is fixed and sealed to the sealing cover (2). Its inner cavity is connected to the inner cavity of the sample box (1) through a vent (25) opened on the sealing cover (2). The guide post (62) consists of two symmetrically arranged guide rods, which are fixed to the upper end of the first tube (61) and extend upward. The spring (11) is sleeved on the outside of the first tube (61) and the guide post (62).

6. The endocrine diabetic foot retrieval device according to claim 5, characterized in that, The piston (7) includes a movable disc (71), a movable rod (72), and a plug body (73). The movable disc (71) has a through hole (74) that slides with the guide post (62). The upper end of the movable rod (72) is fixed to the movable disc (71), and the lower end is fixed to the plug body (73). The plug body (73) is movably and sealingly fitted in the inner cavity of the first tube (61). The upper end of the spring (11) is fixed to the lower end face of the movable disc (71).

7. The endocrine diabetic foot scavenging device according to any one of claims 3 to 6, characterized in that, The connector (8) includes a tube (81), a first knob (82), a third sealing ring (83), and a second threaded tube (84). The sealing cover (2) has a hole (24). The second threaded tube (84) passes through the hole (24) and extends downward. The upper end of the drain tube (9) is threaded to the second threaded tube (84) and presses the third sealing ring (83) between the first knob (82) and the sealing cover (2).

8. The endocrine diabetic foot retrieval device according to claim 7, characterized in that, The lower end of the drain tube (9) extends to the lower part of the inner cavity of the sample box (1) to guide the collected sample to the bottom of the sample box (1).

9. The endocrine diabetic foot retrieval device according to claim 8, characterized in that, The surface of the float (5) has a hydrophobic and antibacterial coating.

10. The endocrine diabetic foot retrieval device according to claim 9, characterized in that, The sealing cover (2) includes a cover body (21) and a positioning plate (22) integrally formed on the lower end of the cover body (21). The positioning plate (22) is engaged and matched with the opening of the sample box (1). The sealing ring (3) is held between the lower end face of the cover (21) and the open end face of the sample box (1).

Images